title: A rare-earth phosphor containing one-dimensional chains identified through combinatorial methods
abstract: An unusual luminescent inorganic oxide, Sr2CeO4, was identified by parallel screening techniques from within a combinatorial library of more than 25,000 members prepared by automated thin-film synthesis. A bulk sample of single-phase Sr2CeO4 was prepared, and its structure, determined from powder x-ray diffraction data, reveals one-dimensional chains of edge-sharing CeO6 octahedra, with two terminal oxygen atoms per cerium center, that are isolated from one another by Sr2+ cations. The emission maximum at 485 nanometers appears blue-white and has a quantum yield of 0.48 +/- 0.02. The excited-state lifetime, electron spin resonance, magnetic susceptibility, and structural data all suggest that luminescence originates from a ligand-to-metal Ce4+ charge transfer.
authors.affiliation: Symyx Technologies, 3100 Central Expressway, Santa Clara, CA 95051, USA. The authors all contributed equally to this work.
authors.initials: E
authors.lastname: Danielson
authors.initials: M
authors.lastname: Devenney
authors.initials: DM
authors.lastname: Giaquinta
authors.initials: JH
authors.lastname: Golden
authors.initials: RC
authors.lastname: Haushalter
authors.initials: EW
authors.lastname: McFarland
authors.initials: DM
authors.lastname: Poojary
authors.initials: CM
authors.lastname: Reaves
authors.initials: WH
authors.lastname: Weinberg
authors.initials: XD
authors.lastname: Wu